A comprehensive energy storage phase change refrigeration system

Abstract

The utility model relates to the technical field of energy storage systems, and specifically to an energy storage phase change refrigeration integrated system, including a compressor, a first heat exchanger, a second heat exchanger, an adjusting component and a cold plate component; a gas-liquid mixture is provided in the cold plate component; a first channel and a second channel are provided in the first heat exchanger; one end of the compressor is connected to one end of the second heat exchanger through the first channel; the other end of the second heat exchanger is connected to one end of the cold plate component through the adjusting component; the other end of the cold plate component is connected to the other end of the compressor through the second channel. The utility model realizes incomplete evaporation at the cold plate component, so that a gas-liquid mixture is formed in the cold plate component, which can ensure the constant temperature at the cold plate, thereby reducing the temperature difference between the cold plates; in addition, by providing the first heat exchanger, the gas-liquid mixture can be completely evaporated into a gaseous state and enter the compressor in a gaseous form, thereby ensuring the stability of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, and in particular to an energy storage phase change refrigeration integrated system. Background Art

[0002] The energy storage temperature control system can greatly affect the efficiency of the energy storage system. There are currently three types of refrigeration on the market:

[0003] The first is air-cooled direct expansion refrigeration: the fan sends cold air to the battery on the evaporation side of the refrigeration. In this solution, due to the battery air duct problem, the temperature difference of the battery cell is concentrated between 8-10℃, which greatly affects the efficiency of the energy storage system.

[0004] The second is the energy storage ethylene glycol aqueous solution cold plate liquid cooling. This solution requires the replacement of the intermediate plate, and at the same time, the cold plate on the battery cell side uses ethylene glycol aqueous solution. Due to the non-uniform current, inconsistent battery cell temperatures are prone to occur. Currently, the temperature difference between battery cells in this system is usually 5-8°C.

[0005] The third is immersion liquid cooling. This solution requires the replacement of the intermediate plate, and the battery cell side is immersed in insulating liquid. It has high efficiency and a good temperature difference of 2-5°C. However, the insulating liquid is expensive, the initial investment is large, and maintenance is very difficult. Utility Model Content

[0006] The purpose of the utility model is to provide an energy storage phase change refrigeration integrated system to address the above-mentioned deficiencies in the prior art, which can effectively ensure the temperature difference of the cold plate and the stability of the system.

[0007] The purpose of the utility model is achieved through the following technical solutions: an energy storage phase change refrigeration integrated system, comprising a compressor, a first heat exchanger, a second heat exchanger, a regulating component and a cold plate component; a gas-liquid mixture is arranged in the cold plate component;

[0008] The first heat exchanger is provided with a first channel and a second channel; one end of the compressor is connected to one end of the second heat exchanger through the first channel; the other end of the second heat exchanger is connected to one end of the cold plate assembly through the adjusting assembly; the other end of the cold plate assembly is connected to the other end of the compressor through the second channel.

[0009] The utility model is further configured that the cold plate assembly includes a liquid dispenser, a distribution head, a plurality of cold plates, a plurality of capillaries and a plurality of soft copper tubes;

[0010] One end of the liquid distributor is connected to the regulating component; the other end of the liquid distributor is connected to one end of the distribution head after passing through a capillary, a cold plate and a soft copper tube in sequence; the other end of the distribution head is connected to the second channel.

[0011] The utility model is further configured such that the lengths of the plurality of capillaries are all the same.

[0012] The utility model is further configured that the lengths of the plurality of soft copper tubes are all the same.

[0013] The utility model is further configured that the regulating assembly includes a throttle valve; the other end of the second heat exchanger is connected to one end of the cold plate assembly through the throttle valve;

[0014] A first pressure sensor and a first temperature sensor are provided between the other end of the cold plate assembly and the second channel.

[0015] The utility model is further configured that a second pressure sensor and a second temperature sensor are provided between the throttle valve and the other end of the second heat exchanger; and a second fan is provided at the second heat exchanger.

[0016] The utility model is further configured such that a first fan is provided at the first heat exchanger; and a third temperature sensor is provided between the second channel and the other end of the compressor.

[0017] The utility model is further configured such that a gas-liquid separator is provided between the second channel and the other end of the compressor.

[0018] The utility model is further configured such that the first heat exchanger is a plate heat exchanger.

[0019] The utility model is further configured such that the first fan is arranged on a side close to the first channel.

[0020] The utility model is further configured that the cold plate assembly includes a liquid distributor, a plurality of cold plates, a plurality of capillaries and a liquid collecting and distributing tube;

[0021] One end of the liquid distributor is connected to the regulating component; the other end of the liquid distributor is connected to the second channel after passing through the capillary, the cold plate and the liquid collecting and distributing tube in sequence.

[0022] The utility model is further configured such that the lengths of the plurality of capillaries are all the same; and the lengths of the branch pipes of the liquid collecting and distributing pipes are all the same.

[0023] Beneficial effects of the utility model: the utility model realizes incomplete evaporation at the cold plate assembly, so that a gas-liquid mixture is formed in the cold plate assembly, which can ensure the constant temperature at the cold plate, thereby reducing the temperature difference between the cold plates; in addition, by setting a first heat exchanger, the gas-liquid mixture can be completely evaporated into a gaseous state and enter the compressor in a gaseous form, thereby ensuring the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0025] Figure 1 It is a structural principle diagram of Embodiment 1 of the present utility model;

[0026] Figure 2 It is a structural principle diagram of Embodiment 2 of the present utility model;

[0027] Among them: 1. compressor; 2. first heat exchanger; 21. first channel; 22. second channel; 3. second heat exchanger; 4. regulating component; 41. first pressure sensor; 42. first temperature sensor; 51. liquid distributor; 52. distribution head; 53. cold plate; 54. capillary; 55. soft copper tube; 61. second pressure sensor; 62. second temperature sensor; 63. second fan; 71. first fan; 72. third temperature sensor; 8. gas-liquid separator; 9. collecting and distributing pipe. DETAILED DESCRIPTION

[0028] The utility model is further described in conjunction with the following embodiments.

[0029] Embodiment 1, by Figure 1 It can be seen that the energy storage phase change refrigeration integrated system described in this embodiment includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, an adjustment component 4 and a cold plate component; a gas-liquid mixture is provided in the cold plate component;

[0030] The first heat exchanger 2 is provided with a first channel 21 and a second channel 22; one end of the compressor 1 is connected to one end of the second heat exchanger 3 through the first channel 21; the other end of the second heat exchanger 3 is connected to one end of the cold plate assembly through the adjustment assembly 4; the other end of the cold plate assembly is connected to the other end of the compressor 1 through the second channel 22.

[0031] Specifically, the energy storage phase change refrigeration integrated system described in this embodiment realizes incomplete evaporation at the cold plate assembly, so that a gas-liquid mixture is formed in the cold plate assembly. Compared with the pure liquid in the traditional cold plate 53, the temperature difference between the pure liquids is large, and the gas-liquid mixture is the temperature critical point, which can ensure that the temperature at the cold plate 53 is constant, thereby reducing the temperature difference between the cold plates 53;

[0032] In addition, by setting up the first heat exchanger 2, the high-temperature gaseous refrigerant of the compressor 1 passes through the first channel 21, and the gas-liquid mixture of the cold plate assembly passes through the second channel 22. The first channel 21 and the second channel 22 exchange heat, so that the gas-liquid mixture in the second channel 22 can completely absorb heat and evaporate into gas, which can ensure that it enters the compressor 1 in gaseous form, thereby ensuring the stability of the system.

[0033] In the energy storage phase change refrigeration integrated system described in this embodiment, the cold plate assembly includes a liquid distributor 51, a distribution head 52, a plurality of cold plates 53, a plurality of capillaries 54 and a plurality of soft copper tubes 55;

[0034] One end of the liquid distributor 51 is connected to the regulating assembly 4 ; the other end of the liquid distributor 51 is connected to one end of the distribution head 52 after passing through the capillary 54 , the cold plate 53 and the soft copper tube 55 in sequence; the other end of the distribution head 52 is connected to the second channel 22 .

[0035] Specifically, this embodiment can ensure the uniformity of each flow path by auxiliary liquid separation through the liquid separator 51 and the capillary 54, thereby ensuring uniform temperature difference in various parts of the battery cell.

[0036] In the energy storage phase change refrigeration integrated system described in this embodiment, the lengths of the multiple capillaries 54 are the same. In the energy storage phase change refrigeration integrated system described in this embodiment, the lengths of the multiple soft copper tubes 55 are the same. Specifically, in this embodiment, through the arrangement of the liquid distributor 51, the equal-length capillaries 54, the equal-length soft copper tubes 55 and the distribution head 52, since each flow path is a flow path of equal length and size, the flow rate tends to be consistent, thereby ensuring that the temperature difference at each part of the battery cell is uniform.

[0037] In the energy storage phase change refrigeration integrated system described in this embodiment, the regulating component 4 includes a throttle valve; the other end of the second heat exchanger 3 is connected to one end of the cold plate assembly through the throttle valve;

[0038] A first pressure sensor 41 and a first temperature sensor 42 are provided between the other end of the cold plate assembly and the second channel 22 ; the first pressure sensor 41 , the first temperature sensor 42 and the throttle valve are electrically connected through an electric control box.

[0039] Specifically, in this embodiment, the pressure and temperature values ​​at the other end of the cold plate assembly are detected by the first pressure sensor 41 and the first temperature sensor 42 respectively, the corresponding saturation temperature value is calculated by the pressure value measured by the first pressure sensor 41, and the saturation temperature value is subtracted from the temperature value measured by the first temperature sensor 42 to obtain the refrigerant superheat at the outlet of the cold plate assembly;

[0040] At this time, it is compared with the set value of the refrigerant superheat. If it is greater than the set value, the refrigerant flow rate is increased by increasing the opening of the throttle valve to reduce the refrigerant superheat; if it is less than the set value, the refrigerant flow rate is reduced by closing the opening of the throttle valve to increase the refrigerant superheat to match the set value, ensuring that after heat exchange through the cold plate 53, the refrigerant is still in a low-pressure gas-liquid mixed state when it comes out of the cold plate 53.

[0041] In the energy storage phase change refrigeration integrated system described in this embodiment, a second pressure sensor 61 and a second temperature sensor 62 are provided between the throttle valve and the other end of the second heat exchanger 3; a second fan 63 is provided at the second heat exchanger 3; the second pressure sensor 61, the second temperature sensor 62 and the second fan 63 are electrically connected through an electrical control box.

[0042] Specifically, in this embodiment, the pressure value and temperature value at the outlet of the second heat exchanger 3 are respectively detected by the second pressure sensor 61 and the second temperature sensor 62, and the corresponding saturation temperature value is calculated by the pressure value measured by the second pressure sensor 61, and the refrigerant subcooling degree at the outlet of the second heat exchanger 3 is obtained by subtracting the temperature value measured by the second temperature sensor 62 from the saturation temperature value;

[0043] At this time, it is compared with the set value of the refrigerant supercooling. If it is greater than the set value, the refrigerant supercooling is reduced by reducing the heat exchange by lowering the rotation speed of the second fan 63; if it is less than the set value, the refrigerant supercooling is increased by increasing the rotation speed of the second fan 63 to increase the heat exchange and match the set value, ensuring that after throttling by the throttle valve, the refrigerant is in a low-pressure gas-liquid mixed state and enters the cold plate 53 to achieve the cooling purpose.

[0044] In the energy storage phase change refrigeration integrated system described in this embodiment, a first fan 71 is provided at the first heat exchanger 2; a third temperature sensor 72 is provided between the second channel 22 and the other end of the compressor 1; the third temperature sensor 72, the first pressure sensor 41 and the first fan 71 are electrically connected through an electrical control box.

[0045] Specifically, in order to ensure the temperature uniformity at the cold plate 53 in this embodiment, after incomplete evaporation at the cold plate 53, there will be liquid refrigerant present, and the pressure value detected by the first pressure sensor 41 and the temperature value detected by the third temperature sensor 72;

[0046] The corresponding saturation temperature value is calculated by the pressure value measured by the first pressure sensor 41, and the suction superheat at the outlet of the second channel 22 of the first heat exchanger 2 is obtained by subtracting the saturation temperature value from the temperature value measured by the third temperature sensor 72;

[0047] At this time, it is compared with the set value of the suction superheat. If it is greater than the set value, the suction superheat is reduced by reducing the heat exchange by lowering the rotation speed of the first fan 71; if it is less than the set value, the suction superheat is increased by increasing the rotation speed of the first fan 71 to increase the heat exchange and match the set value, so that the refrigerant can be completely evaporated; so that the gas-liquid mixture in the second channel 22 can be completely evaporated into a gaseous state, and can be guaranteed to enter the compressor 1 in a gaseous form, thereby ensuring the stability of the system.

[0048] In the energy storage phase change refrigeration integrated system described in this embodiment, a gas-liquid separator 8 is provided between the second channel 22 and the other end of the compressor 1. Specifically, the above arrangement can ensure that even if a small amount of liquid refrigerant appears at the outlet of the second channel 22 in extreme cases, the compressor 1 will not be damaged, and the gas-liquid separator 8 is added to protect the compressor 1.

[0049] In the energy storage phase change refrigeration integrated system described in this embodiment, the first heat exchanger 2 is a plate heat exchanger. The above arrangement enables the first channel 21 and the second channel 22 to perform sufficient and effective heat exchange.

[0050] In the energy storage phase change refrigeration integrated system described in this embodiment, the first fan 71 is integrated with the first heat exchanger 2, and the rotation speed only affects the heat exchange efficiency between the pipes of the first heat exchanger 2, and does not exchange heat with the external air. The above arrangement facilitates the complete transfer of heat from the first channel 21 to the second channel 22.

[0051] Embodiment 2, as Figure 2 As shown, the difference from the embodiment is that the energy storage phase change refrigeration integrated system described in this embodiment, the cold plate assembly includes a liquid distributor 51, a plurality of cold plates 53, a plurality of capillaries 54 and a liquid collecting and distributing pipe 9;

[0052] One end of the liquid distributor 51 is connected to the regulating assembly 4 ; the other end of the liquid distributor 51 is connected to the second channel 22 after passing through the capillary 54 , the cold plate 53 and the liquid collecting and distributing tube 9 in sequence.

[0053] Specifically, since the soft copper tube 55 and the distribution head 52 of the above-mentioned embodiment 1 may be inconvenient in engineering construction, a collecting and distributing liquid tube 9 may be used as an equivalent replacement.

[0054] In the energy storage phase change refrigeration integrated system described in this embodiment, the lengths of the multiple capillaries 54 are the same; the lengths of the branch pipes of the collecting and distributing pipe 9 are the same. The above arrangement can ensure that the flow rate and resistance of each cold plate flow path are consistent, so that a uniform temperature difference can be achieved.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. An energy storage phase change refrigeration integrated system, characterized in that: It comprises a compressor (1), a first heat exchanger (2), a second heat exchanger (3), an adjustment component (4) and a cold plate component; a gas-liquid mixture is arranged in the cold plate component; The first heat exchanger (2) is provided with a first channel (21) and a second channel (22); one end of the compressor (1) is connected to one end of the second heat exchanger (3) via the first channel (21); the other end of the second heat exchanger (3) is connected to one end of a cold plate assembly via an adjustment assembly (4); and the other end of the cold plate assembly is connected to the other end of the compressor (1) via the second channel (22).

2. The energy storage phase change refrigeration integrated system according to claim 1, characterized in that: The cold plate assembly comprises a liquid distributor (51), a distribution head (52), a plurality of cold plates (53), a plurality of capillaries (54) and a plurality of soft copper tubes (55); One end of the liquid distributor (51) is connected to the regulating assembly (4); the other end of the liquid distributor (51) is connected to one end of the distribution head (52) after passing through a capillary (54), a cold plate (53) and a soft copper tube (55) in sequence; the other end of the distribution head (52) is connected to the second channel (22).

3. The energy storage phase change refrigeration integrated system according to claim 2 is characterized in that: The lengths of the plurality of capillaries (54) are all the same; the lengths of the plurality of soft copper tubes (55) are all the same.

4. The energy storage phase change refrigeration integrated system according to claim 1, characterized in that: The regulating component (4) comprises a throttle valve; the other end of the second heat exchanger (3) is connected to one end of the cold plate component through the throttle valve; A first pressure sensor (41) and a first temperature sensor (42) are provided between the other end of the cold plate assembly and the second channel (22).

5. The energy storage phase change refrigeration integrated system according to claim 4 is characterized in that: A second pressure sensor (61) and a second temperature sensor (62) are provided between the throttle valve and the other end of the second heat exchanger (3); and a second fan (63) is provided at the second heat exchanger (3).

6. The energy storage phase change refrigeration integrated system according to claim 4, characterized in that: A first fan (71) is provided at the first heat exchanger (2); and a third temperature sensor (72) is provided between the second channel (22) and the other end of the compressor (1).

7. The energy storage phase change refrigeration integrated system according to claim 1 is characterized by: A gas-liquid separator (8) is provided between the second channel (22) and the other end of the compressor (1).

8. The energy storage phase change refrigeration integrated system according to claim 1, characterized in that: The first heat exchanger (2) is a plate heat exchanger.

9. The energy storage phase change refrigeration integrated system according to claim 1, characterized in that: The cold plate assembly comprises a liquid distributor (51), a plurality of cold plates (53), a plurality of capillaries (54) and a liquid collecting and distributing tube (9); One end of the liquid distributor (51) is connected to the regulating assembly (4); the other end of the liquid distributor (51) is connected to the second channel (22) after passing through a capillary (54), a cold plate (53) and a liquid collecting and distributing tube (9) in sequence.

10. The energy storage phase change refrigeration integrated system according to claim 9, characterized in that: The lengths of the plurality of capillaries (54) are all the same; the lengths of the branch pipes of the liquid collecting and distributing pipe (9) are all the same.

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